[Experimental study on the glutamine's intervention effect on the opening of permeability transition pore in myocardial mitochondrial membrane].

Objective: To explore the intervention effect and the possibly mechanism of the glutamine (Gln) on the opening change of the permeability transition pore (PTP) in the myocardial mitochondrial membrane under the overtraining state.

Methods: 30 SD rats were randomly divided into 3 groups (n = 10): control group (CG group), overtraining group (OG group) and supplementary (Gln) + overtraining group group). Spectrophotometry was used to test the openness of the permeability transition pore in the myocardial mitochondrial membrane. Electrochemistry was used to test the malondialdehyde (MDA) and the glutathione (GSH) content and the phospholipase A2 (PLA2) activity.

Results: OG group compared with the GOG group, the absorbance (A0) and the absorbance change (Delta A) were decreased significantly (P < 0.05). Rh123 fluorescence (F0) intensity was significantly increased (P < 0.05). Rhodamine123 (Rh123) fluorescence change (delta F) was significantly decreased (P < 0.05). Compared with the GOG, the mitochondrial GSH was significantly decreased (P < 0.05), the PLA2 activity and the content of MDA were significantly increased (P <0.05).

Conclusion: Overtraining could lead to opening increase of permeability transition pore in the myocardial mitochondrial membrane, after overtraining, the production of the reactive oxygen species (ROS) and PLA2 activity were increased, GSH content was decreased. But added exogenous Gln had a significant intervention effect for these changes.